//
// Copyright (c) 2004-2024 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// * Neither the name of Jaroslaw Kowalski nor the names of its
//   contributors may be used to endorse or promote products derived from this
//   software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// THE POSSIBILITY OF SUCH DAMAGE.
//

namespace NLog.UnitTests.LayoutRenderers
{
    using System;
    using Xunit;

    public class EnvironmentTests : NLogTestBase
    {
        [Fact]
        public void EnvironmentTest()
        {
            AssertLayoutRendererOutput("${environment:variable=PATH}", Environment.GetEnvironmentVariable("PATH"));
        }

        [Fact]
        public void EnvironmentSimpleTest()
        {
            AssertLayoutRendererOutput("${environment:PATH}", Environment.GetEnvironmentVariable("PATH"));
        }

        [Fact]
        public void Environment_WhenVariableIsLayout_ShouldBeWrittenAsLayout()
        {
            Environment.SetEnvironmentVariable("NLOGTEST", "${level}");
            AssertLayoutRendererOutput("${environment:variable=NLOGTEST}", "Info");
            AssertLayoutRendererOutput("${environment:NLOGTEST}", "Info");
        }

        [Fact]
        public void Environment_WhenVariableExists_DoNothing()
        {
            Environment.SetEnvironmentVariable("NLOGTEST", "ABC1234");
            // Test default value with different variations on variable parameter syntax.
            AssertLayoutRendererOutput("${environment:variable=NLOGTEST:default=5678}", "ABC1234");
            AssertLayoutRendererOutput("${environment:NLOGTEST:default=5678}", "ABC1234");
        }

        [Fact]
        public void Environment_empty()
        {
            using (new NoThrowNLogExceptions())
            {
                AssertLayoutRendererOutput("${environment}", "");
                AssertLayoutRendererOutput("${environment:noDefault}", "");
            }
        }

        [Fact]
        public void Environment_WhenVariableIsLayoutAndExists_DoNothing()
        {
            Environment.SetEnvironmentVariable("NLOGTEST", "${level}");
            AssertLayoutRendererOutput("${environment:NLOGTEST:default=5678}", "Info");
        }

        [Fact]
        public void Environment_WhenVariableDoesNotExists_UseDefault()
        {
            if (Environment.GetEnvironmentVariable("NLOGTEST") != null)
            {
                Environment.SetEnvironmentVariable("NLOGTEST", null);
            }

            // Test default value with different variations on variable parameter syntax.
            AssertLayoutRendererOutput("${environment:variable=NLOGTEST:default=1234}", "1234");
            AssertLayoutRendererOutput("${environment:NLOGTEST:default=5678}", "5678");
        }

        [Fact]
        public void Environment_WhenDefaultEmpty_EmptyString()
        {
            if (Environment.GetEnvironmentVariable("NLOGTEST") != null)
            {
                Environment.SetEnvironmentVariable("NLOGTEST", null);
            }

            // Test default value with different variations on variable parameter syntax.
            AssertLayoutRendererOutput("${environment:variable=NLOGTEST:default=}", "");
            AssertLayoutRendererOutput("${environment:NLOGTEST:default=}", "");
        }
    }
}
